Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1997-06-02
1998-09-22
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
367103, 367119, G01S 1589
Patent
active
058124942
ABSTRACT:
A system for generating a wide-angle, forward-looking bathymetric map of an region ensonified by single ping. A transmitter generates a large angle transmit pulse. An array of acoustic transducer elements operates to transmit the pulse, receive acoustic return signals and convert the returns into digital acoustic data. A receiver matched filters, shades and steers the data through a series of horizontal angles. For each horizontal angle steered to, the receiver generates vertical beams and identifies detections as those vertical beams having magnitudes greater than a detection threshold. Vertical beam forming and detection identification is repeated for each time slice in a series of time slices over the ping cycle. The identified detections are refined using a curve fitting analysis and stored in equal angular vertical bins. A bottom profile is generated from the refined angles and magnitudes. The profile is filtered to remove outliers in magnitude and space to obtain a bottom map for the horizontal steering angle. The bottom maps from each horizontal angle are compiled into a single wide-angle, forward-looking map.
REFERENCES:
patent: 4815045 (1989-03-01), Nakamura
patent: 4939700 (1990-07-01), Breton
Eipert William F.
Lall Prithvi C.
Lobo Ian J.
McGowan Michael J.
The United States of America as represented by the Secretary of
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